Geographic Range

Clouded sulphurs are widespread across North America in the Nearctic region, occurring from the Arctic south to Guatamala. The subspecies Colias philodice vitabunda is found only in northern British Columbia to the Alaskan tundra. (Opler and Krizek, 1984; Scott, 1986)

Physical Description

Adults are yellow, with submarginal dots on the undersides of the hindwings. There is one silver spot in the center of the hindwing with two red rings around it, and often there is a satellite spot. Females have a narrow black forewing border with light spots. The subspecies C. philodice vitabunda has mostly white females. The average wing measurement of female clouded sulphurs is 2.6 cm, and ranges from 2.2 cm - 3.1 cm; males range from 2.2 cm - 3.2 cm with an average of 2.4 cm. Clouded Sulphurs may hybridize with orange sulphurs (Colias eurydice). (Opler and Krizek, 1984; Scott, 1986)

Clouded sulphur eggs are cream colored when first deposited, then turn crimson in a day or two. The larvae are green, sometimes with pale yellow sides, with raised points and a faint green mid-dorsal line. There is a white lateral band on the larval body. (Scott, 1986)

The pupa is green with yellowish white and black mottling and a yellow band. (Scott, 1986)

Development

The last larvae of the year are reported to overwinter in the third stage (sometimes fourth). Other reports state that the clouded sulphurs overwinter as crysalis. (Opler and Krizek, 1984; Scott, 1986)

Reproduction

The mating system of clouded sulphurs has been well documented. As the male flies toward the female, she will land and the male will proceed to buffet his wings against her body, releasing pheremones that are produced in a gland in a patch on the upper surface of the hindwing. If the female detects the pheremone and it activates her responses, she will lower her abdomen and the pair will mate. Females will also approach males when they are ready to mate. (Scott, 1986)

As a male clouded sulphur flies toward a female, she will land and the male will proceed to buffet his wings against her body, releasing special communication chemicals (pheromomes) that are produced in a gland in a patch on the upper surface of the hindwing. If the female detects the pheremone and it activates her responses, she will lower her abdomen and the pair will mate. Females will also approach males when they are ready to mate. (Scott, 1986)

Females that are less than one hour old cannot differentiate between the pheremones of clouded and orange sulphurs. It is during this time that the most frequent hybridization occurs. Usually, only sterile females are produced. When there is a female clouded sulphur and a male orange sulphur, viable offspring are produced. (Scott, 1986)

There are several broods of clouded sulphurs from spring until fall, the actual number depending on the latitude. Colias philodice vitabunda flies mainly from June until mid-July. (Opler and Krizek, 1984; Scott, 1986)

Lifespan/Longevity

In Colorado, clouded sulphurs lived an average of 2-3 days, with the longest surviving 2 weeks. In Colorado, females lived 17 days and males 24 days (average 2-7 days). In Virginia, males lived for 17 days. (Scott, 1986)

Range lifespanStatus: wild

2 to 24 days

Average lifespanStatus: wild

5 days

Typical lifespanStatus: wild

2 to 7 days

Average lifespanStatus: wild

5 days

Behavior

The flight pattern of clouded sulphurs is fairly rapid and sometimes erratic. They usually stay within one meter of the ground. Clouded sulphurs are well known for their mud-puddling behavior, - gathering in groups to sip from the mud in wet places. Most believe butterflies are seeking out salts and minerals from the water. (Iftner, et al., 1992)

Predation

Predators of all life stages of butterflies include a variety of insect parasatoids. These wasps or flies will consume the body fluids first, and then eat the internal organs, ultimately killing the butterfly. Those wasps that lay eggs inside the host body include species in many different groups: Ichneumonidae, Braconidae, Pteromalidae, Chalcidoidea, Encyrtidae, Eulophidae, Scelionidae, Trichogrammatidae, and others. Trichogrammatids live inside the eggs, and are smaller than a pinhead. Certain flies (Tachinidae, some Sarcophagidae, etc.) produce large eggs and glue them onto the outside of the host larva, where the hatching fly larvae then burrow into the butterfly larvae. Other flies will lays many small eggs directly on the larval hostplants, and these are ingested by the caterpillars as they feed. (Scott, 1986)

Conservation Status

Other Comments

Clouded and orange sulphurs exhibit chromosome polymorphism - genes controlling female mate choice, male pheremones, male ultraviolet reflection (in orange sulphurs only), orange or yellow color, width of the black forewing border size, and the rate of development are all located on the X chromosome, termed a "supergene". It has been found that nearly all differences between the two species occurs on this X chromosome. Female hybrids preferably mate with males of their fathers' species (orange sulphurs), thus the X chromosome stays with the appropriate species. (Scott, 1986)

The genus Colis is believed to be named after Kolias, the epithet of Venus (Greek mythology). The species may have been named after the sea nymph Phyllodoce. (Opler and Krizek, 1984)

Contributors

Matthew Wund (editor), University of Michigan-Ann Arbor.

Barb Barton (author), Special Contributors.

Glossary

Nearctic

living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

agricultural

living in landscapes dominated by human agriculture.

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

chemical

uses smells or other chemicals to communicate

colonial

used loosely to describe any group of organisms living together or in close proximity to each other - for example nesting shorebirds that live in large colonies. More specifically refers to a group of organisms in which members act as specialized subunits (a continuous, modular society) - as in clonal organisms.

diurnal

active during the day, 2. lasting for one day.

ecotourism

humans benefit economically by promoting tourism that focuses on the appreciation of natural areas or animals. Ecotourism implies that there are existing programs that profit from the appreciation of natural areas or animals.

ectothermic

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature

fertilization

union of egg and spermatozoan

folivore

an animal that mainly eats leaves.

herbivore

An animal that eats mainly plants or parts of plants.

heterothermic

having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.

internal fertilization

fertilization takes place within the female's body

metamorphosis

A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.

motile

having the capacity to move from one place to another.

native range

the area in which the animal is naturally found, the region in which it is endemic.

nectarivore

an animal that mainly eats nectar from flowers

oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

pheromones

chemicals released into air or water that are detected by and responded to by other animals of the same species

seasonal breeding

breeding is confined to a particular season

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

suburban

living in residential areas on the outskirts of large cities or towns.

tactile

uses touch to communicate

temperate

that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).

terrestrial

Living on the ground.

tropical savanna and grassland

A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia.

savanna

A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome.

temperate grassland

A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands.

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The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

This material is based upon work supported by the
National Science Foundation
Grants DRL 0089283, DRL 0628151, DUE 0633095, DRL 0918590, and DUE 1122742. Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services.